@conference{rix1999perceptual, title = {Perceptual SpeechQuality Assessment from Narrowband Telephony to Wideband Audio}, author = {Rix, Antony and Hollier, Mike}, booktitle = {Audio Engineering Society Convention 107}, month = {Sep}, year = {1999}, url = {https://www.aes.org/e-lib/browse.cfm?elib=8162} }